For those of you who have been awaiting eagerly the story behind this query, I can now provide the answer.
It was, indeed, as a form of internal accounting, but in somewhat specialised circumstances - it was used when individual items, sent out in bulk mailing, had been refused by the recipient and returned to the sender. At the time, there was a charge for this, so the sender of the original items (unfortunately unknown) would have been billed the 1/6d for the return of the items, the money collected being accounted for thus.
Probably not a valuable item, but to me an interesting piece of postal history.
Tony
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